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JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Formation of which complex, among the following, is not a confirmatory test of $$\mathrm{Pb}^{2+}$$ ions :
2
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match List I with List II
| List I Elements |
List II Colour imparted to the flame |
||
|---|---|---|---|
| A. | K | I. | Brick Red |
| B. | Ca | II. | Violet |
| C. | Sr | III. | Apple Green |
| D. | Ba | IV. | Crimson Red |
Choose the correct answer from the options given below :
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match the List-I with List-II :
| List-I Cations |
List-II Group reagents |
||
|---|---|---|---|
| A. | $$\mathrm{Pb^{2+},Cu^{2+}}$$ | i) | $$\mathrm{H_2S}$$ gas in presence of dilute HCl |
| B. | $$\mathrm{Al^{3+},Fe^{3+}}$$ | ii) | $$\mathrm{(NH_4)_2CO_3}$$ in presence of $$\mathrm{NH_4OH}$$ |
| C. | $$\mathrm{Co^{2+},Ni^{2+}}$$ | iii) | $$\mathrm{NH_4OH}$$ in presence of $$\mathrm{NH_4Cl}$$ |
| D. | $$\mathrm{Ba^{2+},Ca^{2+}}$$ | iv) | H2S in presence of NH4OH |
Correct match is -
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